The Delta whiplash is here

This week marked a turning point: Delta caught the country off guard and forced us to revisit our mitigation strategies. Then: Here’s what to read and watch as July turns into August. The Delta whiplash is here. A leaked CDC report, along with some new data released by the agency, put this week’s updated mask rules in context: This variant is more worrisome than previously thought.
America is not back to square one. But Delta is forcing us to reopen our toolkit and reconsider our approach to this virus.
Here are four important things to know.
Delta appears to be extremely transmissible—and responsible for more breakthroughs.
The variant is more transmissible than previous strains of the coronavirus and maybe as transmissible as the chicken pox, the leaked CDC report suggested.
Breakthrough cases also appear more common. At the center of discussion is an outbreak in Massachusetts, where nearly three-fourths of those infected were vaccinated (but only four out of hundreds were hospitalized).
Vaccinated people may be able to transmit the virus more easily than hoped. 
When studying the Massachusetts outbreak, researchers found unvaccinated and vaccinated people might carry similar amounts of the virus in their airways, a measure called viral load.
One key word here is might. Finding virus genetic material in the airway doesn’t guarantee a person is transmitting it (by, say, spitting or sneezing). But it does open up the possibility.
“People need to understand [that] infectiousness is multidimensional,” Müge Çevik, a virologist and infectious-disease expert at the University of St. Andrews, told my colleague Katherine J. Wu. “Viral load is only one piece of the puzzle.”
Fully vaccinated individuals are less likely to get infected, develop symptoms, go to the hospital, or die. They’re still not spreading the virus as often as unvaccinated people. But this is a particularly troubling development for those who are immunocompromised or elderly or live with people who are, as well as the parents of unvaccinated children.
We don’t know what this means for the fall and winter just yet. 
Experts are divided on what the coming seasons will look like. “We unfortunately just have to get a little more comfortable with uncertainty and try to be flexible,” Katie, who is constantly covering the shifting science about the virus, told me.
“Things did just get more complicated,” she said.
“It’s definitely going to be bleak, but I don’t think it’s going to be quite as bad as last winter,” the infectious-disease doctor Gary Simon predicted.  
So what does it mean for you?
Again, it depends on who you are and where you live. As Katie’s recommended in the past, you can check local virus conditions like the weather. The CDC advises those in transmission hot spots to mask up—although you’d be justified in wearing one anywhere.
Soon we may all be in the same boat. “If you’re not in high or substantial transmission today, you probably will be tomorrow or the next day, given the rate of spread of this Delta variant,” one physician told Katie.

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